Related by context. Frequent words. (Click for all words.) 65 Orion Nebula 65 Andromeda Galaxy 62 constellation Orion 62 distant galaxy 61 Andromeda galaxy 60 Betelgeuse 60 Fomalhaut 60 Galaxy Evolution 59 planetary nebulae 59 star Gliese 59 planetary nebula 59 Milky Way Galaxy 59 XMM Newton 58 celestial object 58 globular cluster 58 nebulae 58 Halley comet 58 Jupiter moons 58 Spitzer Space Telescope 58 Cancri 58 NASA Cassini 58 constellation Leo 57 Mimas 57 unaided eye 57 Crab Nebula 57 spiral galaxy 57 Scorpius 57 constellation Perseus 57 nebula 56 HD #b [002] 56 Saturn rings 56 Eta Carinae 56 Comet McNaught 56 Milky Way 56 Hubble observations 56 Pleiades 56 astronomical objects 56 globular clusters 56 supernova remnant 56 extrasolar planets 55 auroral 55 comet 55 supernova remnants 55 COROT 55 planets orbiting 55 galaxy cluster 55 XP# [004] 55 ringed planet 55 planets circling 55 comet tail 55 Sedna 55 moon Charon 55 ejecta 55 Kuiper belt 54 Phaethon 54 supernova explosion 54 Very Large Telescope 54 Cassiopeia 54 X ray emission 54 infrared wavelengths 54 astronomers 54 GRBs 54 Saturn moon Enceladus 54 elliptical galaxies 54 Comet Tempel 1 54 La Silla Chile 54 ecliptic 54 spiral galaxies 54 GRB # 54 Voyager spacecraft 54 planet orbiting 54 meteoroids 54 dwarf galaxy 54 habitable planets 54 brown dwarf 54 planet orbits 54 Suzaku 53 THEMIS 53 Halley Comet 53 brown dwarfs 53 Phobos 53 celestial objects 53 galaxy 53 Large Magellanic Cloud 53 ellipse 53 astronomical observations 53 Venusian 53 Iapetus 53 planets 53 solar corona 53 Gamma ray bursts 53 Nebula 53 comet nucleus 52 moons 52 interstellar dust 52 visible wavelengths 52 active galactic nuclei 52 supernova explosions 52 occultation 52 Andromeda 52 Lutetia